Venturi and method of making the same



Dec. 29 [1925- H. DE BOISCHEVALIER VENTURI AND METHOD OF MAKING THE SAME Filed 001;. 20, 1922 INVENTOR IWQQW Patented :29, 1925.

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VIBE-TUB! AND METHOD OF IAKING THE BAKE.

Application mm was 20,132. Serial no, aa'aave.

Toallwhomitmag concemd V 7 Be it known that I, HENRI DE/BOISOHEVA- m, a citizen of the United States, residing at Detroit, in the county of Wayne and State 6 of Michigan, have invented anew and use- :ful Improvement in Venturis and Methods of Making the Same, of which the following is a full, clear, and exact description.

The present invention relates broadly to 10 Venturi tubes, and more particularly to tubes of this character adapted to be used as air chokes for carburetors, and to the method of. making the same.

At the present time, it is customary to form air chokes for this general purpose from solid castings, thereby adding unnecessary' weight to the carburetor as well as increased cost due to this weight and the machin'ing operations required, or from sheet metal having no outer casing. Construc-' tions of .the latter t fpe do not provide a suificient bearing sur ace within the air passage of the carburetor with which the are used, thereby making it extremely dicult B5 to maintain the same in proper operative position.

This invention provides a venturi comprising an outer casing, preferably of sheet metal so constructed as to permit expansion and-contraction thereof as may be required by reason of variations in the carburetor with which it is used, thereby eliminating the necessity of accurately machining the air assage through the carburetor roper, and aving an inner member, prefera ly also of sheet metal, and shaped to form a converging, diverging flow 'pasage therethroug v p In the accompanyin drawings, there is 40 shown for purposes'of illustration only, one

embodiment of the present invention, it being understood that the drawings do not define the limits of this invention as changes may be made in the construction and opera- 4 tion disclosed herein without departing from the spirit or scope of my broader claims.

In the drawings:

1 Figure 1 is a vertical sectional view through the outer casing of the venturi Figure 2 is a similar view through the inner member before it is bent to final shape; Figure 3 is a vertical sectional view through a complete venturi, and

Figure 4 is aftransverse sectional view on the hne IV'IV, of Figure3.

It will be apparent that where venturis are formed'as separate castings, it is necessary not only to machine the. exterior surface of the venturi per se, but also the inner I surface which forms the air passage throughthe carburetor. These operations do not increase the efiiciency of the carburetor, but are required solel by reason of the construction involved. y this invention the ma: chining of the air passage through the carburetor is made unnecessary as the venturi provided "readily accommodates itself to such variations and irregularities as may be occasioned by the casting operation.

In accordance with this invention, aventuri may be constructed b separately forming an outer member an an inner member and then assembling the same. The outer member may conveniently be iormed of sheet metal to provide a casin 2, the meeting edges 3 of which are left ee to permit a slight expansion and contraction of the casing. The inner member 4 may be formed 11]. any desired manner, as by a, series of drawing operations, to provide a converging, dlverging flow passage therethrough. The upper end of the inner member is preferably bent outwardly to form 'a flange 5'which is substantially equal to the normal exterior diameter of the casing 2, while the lower end of the venturi is so formed that, it may he slipped through the casing 2 and then bent outwardly as illustrated in Figure 3. If desired, it will be clearly understood that the inner member may be bent to the form shown in Figure 3 and the outer casing 2 may hbe then bent in position therearound,

en the parts are in assembled position the end portions of the inner member, by reason of their overlapping engagement with the ends of the outer casing, prevent longitudinal relative movement between the parts. The casing 2 may be formed with an opening 6 adapted to cooperate with a set screw extending through the carburetor wall as is customary in the art.

By leaving the meeting edges of the outer casing free, it is possible to utilize the venturi construction with carburetors presenting slight variations in the dimensions of the air passages therethrough. At the same time, the substantially uniform outer surface o.f the casin 2 provides a large area. of contact with t e carburetor whereby the parts are easily held; in the desired operative positio'n'r.

Further advantages'of the present inven-" tion arise from the simplicity and ease of construction of a venturi of this character whereb the cost of a carburetor may be corresIpon ingly decreased; r 7

claim: v

1. A venturi, comprising an outer casing adapted to be bodily inserted within'the air passage of a carburetor, and an inextensible "inner sheet metal venturi member carried thereby and extending substantially coextensivetherewith, substantially as described. '2. A venturi, cmpr1sing an outer casing adapted to be bodily inserted withinthe air passage of a carburetor, and ,an inextensible sheet metal venturi member carried thereby, :said venturi member having, its upper and lower edges extending outwardly over the ends of the casing, substantially as described.

, as 'descri 3.;A venturi,comprising an outer expansile and contractile casing adapted to be inserted within thejairpassa act a carburetor,

scribed. v,

v 4 In a venturi for carburetors, an outer sheet metal casing and an inner member substantially coextensive therewith extending over the ends thereof and carried thereby and shaped to provide a converging, diver ing' flow aassage therethrough, substantia y 5'. A venturi,comprising an outer expan- ,sile and contractile casing adafpted to be inserted .within the air passageo a carburetor, andan inner sheet metal venturi forming member arried thereby and exte I substantial] woo-extensive therewith, su

stan- .tially as described.

I assume at substantially uni orm diameter throughand-an inner venturi orming mem-. -.ber carried thereby, substantially as. de-

6. A venturi, comprising an outer expansile and contractile casing adapted to be inserted within the air passage of a carburetor, and an inner sheet metal venturi formmember carried therebyjand extending libstantially coextensive therewith, said venturi forming member having its upper and lower ends turned outwardl over said casini substantially as describe 7. venturi com rising an outer casing out its length adapted to be bodily inserted within the airpassage of a carburetor, and an inner inextensib e sheet metal venturi member extending substantially coextensive therewith and secured over the ends thereof, substantially as described.

8. As'an article of manufacture, a venturi comprising an inextensible sheet metal ven-' turi-shaped member having outwardly flanged upper and lower ends, and an en- 6 closing casing surrounding said venturi member substantiall entire y between said ends, said casing an venturi member being adapted to be bodily inserted within the air assag; of a carburetor, substantially as escn d.

9. A venturi comprising a deformable outer casing adapted to be bodily inserted within the air passage of a carburetor, and an inextensibleventuri member. carried thereby, substantially as described.-

,10. A venturi comprising an outer sheet 

